Television apparatus



Sept. 12, 1939. P. P. HOLZER TELEVISION APPARATUS Filed Aug. 10, 1936 2 Sheets-Sheet 1 OUTPU T 0.6.

OUT/ 07: 0.6.

Sept. 12, 1939. P. P. HOLZER 2,172,345

TELEVISION APPARATUS Filed Aug. 10, 1956 2 Sheets-Sheet 2 Patented Sept. 12, 1939 UNITED STATES PATENT ()F-FICE TELEVISION APPARATUS Phillip P. Holzer, Chicago, Ill.

Application August 10, 1936, Serial No. 95,134

3 Claims.

My invention relates to television apparatus and more particularly to an image reproducing tube for use in a television system.

One of the principal objects of my invention 5 is to provide a tube for use in a television receiving system which reproduces the transmitted image in the tube and permits the projection thereof on a large screen.

Another object is to provide a tube for use in 10 television receivers whichreproduces a transmitted image and which thereby eliminates the use of a scanning disc and incidental apparatus employed therewith.

A further object is to provide a device which 1-5. is simple to operate and which reproduces a clearer and larger image than is capable of being reproduced with any of the standard television receiving apparatus.

Several embodiments of the present invention 20 are shown for illustrative purposes in the accompanying drawings in which:

Fig. 1 is a side elevational view of one form of the tube showing the relative positions of the various tube elements.

25 Fig. 2 is a rear elevational view of same.

Fig. 3 is a perspective view partly in section of the image screen shown in Fig. 1.

Fig. 4 is a perspective View of the plate.

Fig. 5 is a side elevational view'of the grid.

, Fig. 6 is a view showing the electrical circuit of the tube.

Fig. 7 is a View showing part of the circuit of the television receiver leading to the tube socket.

Fig. 8 is a front elevational view of a modified 35 form of image screen, which can be substituted for the screen shown in Figs. 1 and 3.

Fig. 9 is a front elevational view of a modified form of grid construction which can be substituted for the grid shown in Figs. 1 and 5.

40 Fig. 10 is an end elevational view of same and Fig. 11 is a top plan view of same.

As shown in Figs. 1 and 2 I provide a vacuum tube l4 having a base IE to which is suitably secured the glass envelope IS. The envelope 45 is provided with an offset rectangular face I! through which the image formed within the tube is to be transmitted. Secured to the base are a plurality of contact pins, generally indicated at l8, to which are connected conducting wires lead- 50 ing from the elements positioned within the tube. At the lower'end of the envelope at right angles to each other, I provide a pair of contact caps l9 and 20 to which are secured certain of the conducting wires presently to be described. In- 55 tegrally formed within the envelope and extending upwardly from the lower end thereof is a reentrant stem 2| which is adapted to support the tube elements and certain of the conducting wires leading to the terminal pins.

As is more particularly shown in Figs. 1, and 3, I provide an image screen 31 of rectangular shape, which is positioned adjacent the rectangular face ll of the envelope. This image screen 31 is formed of two parallel steel grid sections 22 and 23 which are spaced from each other and are supported in a channeled steel frame 24. 'The grid section 22 which is formed of a plurality of spaced vertical bars 22a is press fitted into engagement with a similarly formed grid section 23 having horizontally spaced bars 23a. Thus as shown when the grid sections are secured together the bars of one grid section are at right angles to the other.

Around the channeled steel frame 24, I pr vide a coil 25 which when energized by an electrical charge creates a magnetic field about the grid sections. The terminals d and 25b of the coil pass through the re-entrant stem and are connected to terminal pins a and b respectively inthe base.

Secured rearwardly of the image screen I provide an anode element which comprises a pair of V-shaped metal plates 26 and 21 which are positioned so that their apexes point towards each other. To these plates are connected conducting wires 26a and 21a which pass through the reentrant stem and are secured to the terminal pins 0 and (1 respectively.

Positioned adjacent to the anode plates is a grid element 28 more particularly shown in Fig. 5 which is sup-ported on the re-entrant stem by a bar 33 and which is formed of two grid sections 30 and 3| spaced apart and insulated from each other as at 32 and arranged so that the bars of one section are at right angles to the other. The grid sections are provided with conducting wires 30a and 3m which pass through the reentrant stem and are secured to terminal pins e and f respectively.

Supported on an insulated projecting arm 36 which is secured to the grid structure 28 is the cathode element comprising a filament 35 to which are connected conducting wires 35a and 35b which pass through the re-entrant stem and lead to caps l9 and 20 respectively.

' Fig. 8 shows a modified form of image screen 40 which can be used interchangeably with the screen 31 previously described. It will be seen that the image screen is formed of two grid sec tions 4| and 42, positioned and secured similar to those of Fig. 3 and is provided with a pair of electromagnets 43 and 44 which are mounted on opposite sides of the grid structure, which serve to create a magnetic field about the grid sections. The terminals of the coils of the electro-magnets are connected similarly to that shown in Fig. 6.

The modified form of grid structure shown in Figs. 9, 10 and 11 can be substituted in place of the grid element 28. This grid structure comprises a cage member 46 formed of a plurality of spaced vertical bars 46a. secured in frames 4% and 460. A similarly constructed cage member 4'! is positioned within the outer cage member 48, but has its axis at right angles to the outer cage element.

Referring to Fig. 7 it will be seen that the sources of power for the various tube elements are as indicated. The alphabetically identified terminal pins of the tube are adapted to make contact with corresponding alphabetically identified socket holes while the metal hoods i] and 5| are provided to engage the metal caps l9 and 20 respectively. As is shown in the diagram the electro-magnet of the image screen is energized by power supplied at 20 volts by the power transformer and the filament which has conductors leading to the metal caps 59 and 2% of the tube receives its source of power from the power transformer at a voltage of 6 volts. The other two tube elements i. e., the plate and grid, are connected to the power output.

The high degree of brilliance required in television reproduction is provided by the filament cathode 35, which provides a large flow of electrons and a corresponding brilliance. The cross arrangement of the bar sections or" the grid 28 has the effect of narrowing down the emission of the electrons to thin streams, which flow in the direction of the anode plates 26 and 27.

The high velocity of the electrons tends to carry them in their original paths and only those which do not strike the grid or plate elements continue undeviated in their course. By arranging the plates in the manner shown it can be seen that only a thin stream which flows midway between the plates will be uninfluenced by the plates and will continue in the direction of the image reproducing screen 31, where it is controlled by the magnetic fields set up by the elec trical currents which are introduced in the electro-magnet of the screen in such a relationship to the stream that they cause it to move horizontally and vertically at a. speed and in a direction corresponding to that of the beam being transmitted. By means of a lens positioned in front of the tube, and adjacent the rectangular portion the image can be projected on a screen several feet away to produce a large sized image.

It will be observed from the foregoing description that the present inventionprovides a novel means for the reproduction of transmitted television images and the projection thereof.

Various modifications and changes can be made without departing from the spirit and scope of my invention.

What I desire to secure by Letters Patent is: 1. In a tube for television receiving apparatus, a cathode, an anode, a grid, said grid comprising a pair of parallel grid members positioned axially at right angles to each other, each of said grid members formed of a plurality of spaced parallel bars, an image reproducing screen, said screen comprising a pair of spaced grid elements formed of a plurality of spaced parallel bars, the bars of each of said elements positioned axially at right angles with respect to the bars of the other and an electro-magnetic coil adjacent said image screen.

2. In a tube for television receiving apparatus, a cathode, an anode, a grid, said grid comprising a cage member, formed of a plurality of spaced vertical bars, a similar cage member positioned within said outer cage member, the bars of one member being transverse to the bars of the other and a screen adapted to have an image reproduced thereon.

3. In a tube for television receiving apparatus, a cathode, an anode, a grid, said grid comprising a cage member formed of a plurality of spaced vertical bars, a similar cage member transversely positioned within said outer cage member, a screen adapted to have an image reproduced thereon, said screen comprising a pair of spaced grid elements formed of a plurality of spaced parallel bars, the bars of each of said elements positioned axially at right angles with respect to the bars of the other and an electro-magnetic coil adjacent saidscreen.

PHILLIP P. HOLZER. 

